Fixed cpu_percent() which was raising ZeroDivisionError.
Fixed cpu_percent() which was raising ZeroDivisionError.

qbit/psutil,cloudbase/psutil,jorik041/psutil,packages/psutil,packages/psutil,msarahan/psutil,packages/psutil,landryb/psutil,mindw/psutil,0-wiz-0/psutil,jamesblunt/psutil,tomprince/psutil,jorik041/psutil,Q-Leap-Networks/psutil,jamesblunt/psutil,jamesblunt/psutil,giampaolo/psutil,mindw/psutil,tomprince/psutil,msarahan/psutil,mindw/psutil,cloudbase/psutil,landryb/psutil,mrjefftang/psutil,giampaolo/psutil,msarahan/psutil,cloudbase/psutil,qbit/psutil,landryb/psutil,mindw/psutil,0-wiz-0/psutil,Q-Leap-Networks/psutil,mrjefftang/psutil,mindw/psutil,tomprince/psutil,jorik041/psutil,tomprince/psutil,tomprince/psutil,landryb/psutil,qbit/psutil,landryb/psutil,mrjefftang/psutil